Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem P. 3879. (March 2006)

P. 3879. One end of a chord is attached to a small body which undergoes circular motion on a horizontal frictionless table. There is a hole on the table at the centre of the circle, the chord goes through the hole and the other end of the chord is held by our hand. Pulling this end the body moves from the path of radius r1 to another path of radius r2. By what factor does the kinetic energy of the body change? By what factor does the tension change?

(4 pont)

Deadline expired on April 11, 2006.


Statistics:

117 students sent a solution.
4 points:79 students.
3 points:7 students.
2 points:3 students.
1 point:2 students.
0 point:18 students.
Unfair, not evaluated:8 solutions.

Problems in Physics of KöMaL, March 2006